html, body {
	width: 100%;
	height: 100%;
	padding: 0;
	margin: 0;
}

body {
	position: relative;

	.header {
		width: 100%;
		height: 3em;
		background-color: #393D49;
	}

	.main {
		width: 100%;
		height: 5000px;

		.ad {
			position: absolute;
			top: 0;
			right: 0;
			width: 3em;
			height: 10em;
			background-color: #FFB800;
		}

	}

	.footer {
		width: 100%;
		height: 10em;
		background-color: #009688;
	}

}
